Diane Thuy Tu Nguyen, MD
NPI 1225065428ActiveIndividual· Family Medicine· Westminster, CA
Family Medicine (MD) in Westminster, California, trained at Hahnemann University College of Medicine (class of 1995). Their prescriptions cost Medicare Part D more than their services did: $342,936 for 2,617 claims, against $22,499 paid for services in 2024. Amgen Inc. was the largest of 27 companies reporting payments in 2025, $6,163 in all, mostly food and beverage.
Overview
| NPI | 1225065428 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jun 26, 2006 |
| Last updated in NPPES | Dec 12, 2011 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Family Medicine Primary | 207Q00000X | A84273 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Family Practice (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 100 |
|---|---|
| Services billed | 390 across 30 procedure codes |
| Paid by Medicare | $22,499 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,617 · 5,068 30-day fills |
|---|---|
| Patients | 249 |
| Total drug cost | $342,936 |
| Generic share | 84% of claims |
Education and affiliations
| Medical school | Hahnemann University College of Medicine |
|---|---|
| Graduation year | 1995 |
| Medicare specialty | Family Practice |
| Telehealth | Offers telehealth |
Medical group
- Bolsa Medical GroupWestminster, CA · 14 clinicians
Industry payments (Open Payments)
- 2025$6,163 · 120 payments from 27 companies
- 2024$4,541 · 77 payments from 22 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Amgen Inc. | $1,211 | 25 |
| Lilly USA, LLC | $834.13 | 11 |
| Astrazeneca Pharmaceuticals LP | $654.01 | 28 |
| Novo Nordisk Inc | $389.73 | 4 |
| Glaxosmithkline, LLC. | $313.06 | 6 |
What the 2025 payments were for
- Food and Beverage$6,163 · 120 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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